1. Tardigrade
  2. Question
  3. Chemistry
  4. The electronic configuration of four elements are 1. [ Xe ] 6x1 2. [ Xe ] 4 f 14 5d1 6s2 3. [ A r ] 4s2 4p5 4. [ A r ] 3d7 4s2 Which one of the following statements about these elements is not correct?

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Q. The electronic configuration of four elements are 1. $ [ Xe ] 6x^1$
2. $ [ Xe ] 4 f^{ 14} \, 5d^1 \, 6s^2 $
3. $ [ A r ] 4s^2 \, 4p^5 $
4. $ [ A r ] 3d^7 \, 4s^2 $
Which one of the following statements about these elements is not correct?

KEAMKEAM 2007Classification of Elements and Periodicity in Properties

Solution:

$ [ Xe ] 4 f^{ 14} \, 5d^1 \, 6s^2 $ is not ad-block element. It is lutetium and is present in lanthanide series, so lutetium is a f block element.